GoogleMobileAds Framework Reference

GADCustomEventInterstitialDelegate

@protocolGADCustomEventInterstitialDelegate<NSObject>

Call back to this delegate in your custom event. You must call
customEventInterstitialDidReceiveAd: when there is an ad to show, or
customEventInterstitial:didFailAd: when there is no ad to show. Otherwise, if enough time passed
(several seconds) after the SDK called the requestInterstitialAdWithParameter: method of your
custom event, the mediation SDK will consider the request timed out, and move on to the next ad
network.

Declaration

Your Custom Event object must call this when it fails to receive or create the ad. Pass along
any error object sent from the ad network’s SDK, or an NSError describing the error. Pass nil if
not available.